Dichloromethylene carbamic acid esters and thioesters

ABSTRACT

Dichloromethylenecarbonic acid esters and -thioesters are obtained by reacting dichloromethylenecarbamic acid chloride with alcohols, thioalcohols, phenols or thiophenols at a temperature range of from -50* to + 100* C. The compounds obtained by this process show pesticidal activity. They can, furthermore, be used for the preparation of the corresponding isocyanates.

United States Patent 1 Reiische et al.

11 3,759,975 [451 Sept. 18, 1973 DICHLOROMETHYLENE CARBAMIC ACID ESTERS AND THIOESTERS [75] Inventors: Wolfgang Reiische,

Leverkusen-Schlebusch; Hans Holtschmidt, Leverkusen-Steinbuchel, both of Germany [73] Assignee: Bayer Aktieng esellscll'ait,

Leverkusen, Germany [22] Filed: Dec. 12, 1969 [21] Appl. No.: 884,717

[30] Foreign Application Priority Data Jan. 8, I969 Germany P l9 ()0 755.7

[52] 11.8. CI. 260/465 D, 71/106, 260/455 A, 260/465.4, 260/479 C, 260/482 B, 260/482 [51] Int. Cl. C02c 125/06 [58] Field of Search 2 60/482 C, 465 D [56] References Cited OTHER PUBLICATIONS Neidlein, R. et al. Chem. Ber. 99(1) (1966). Szmank, H. H. Organic Chem. (pg. 242) 1957.

Primary Examiner-Lorraine A. Weinberger Assistant Examiner-Paul J. Killos 4 Att0rneyBurgess, Dinklage and Sprung [57] ABSTRACT 5 Claims, No Drawings 3 ,759,97 a 1 2 DICHLOROMETHYLENE CARBAMIC sen) ssrsns AND THIOESTERS R (xmfl Wherein R represents an n-valent, optionally substi- This invention relates to dichloromethylene rtuted, saturated or unsaturated, aliphatic, araliphatie or bamic acid esters and thioesters and to a process for 5 aromatic radical, X r p n yg n o Sulphur, and their production. n represents an integer from 1 to 6. Examples of such The compounds obtained in accordance with the incompounds include mol'lohydfic and p y y vention co respond t th general f l phatic alcohols and thioalcohols with from 1 to 18 carbon atoms, for example methanol, ethanol, isopropal0 nol, n-butanol, isobutanol, decanols, stearyl alcohol,

- C1 benzyl alcohol, allyl alcohol, propargyl alcohol, 2- methoxyethanol, cyclohexanol, decalols, ethylene gly- R X fi N=C col, diethylene glycol, diethylene glycol monomethyl 0 C1 ether, propylene glycols, 1,4-butane diol, 2-butene-l,4-

diol, 2-butine-l, 4-diol, hexane-1,6-diol, thiodiglycol,

glycerol, trimethylol propane, pentaerythritol, methyl mercaptan, butyl mercaptan, dodecyl mercaptan, stearylmercaptan, Z-mercaptoethanol, sorbitol, and mannitol.

Further starting materials are phenoles and thiophenoles such as phenole, cresoles, chlorophenoles nitrophenoles, anisoles, hydroxyacetophenone, 2,2-bis- (4-hydroxyphenyl)-propane, 4,4'-dihydroxydiphenylsulphone, naphtoles, hydroxyanthracenes, dihydroxybenzoles, -naphtaline and -anthracenes, thiophenole.

Furthermore as starting materials compounds containing hydroxyor thiol groups can be used which are built up from polyethers, polyesters, polythioethers, polyetherpolyesters or polyetherpolythioethers with a molecular weight of from 800 to 3,000.

The starting materials are named in the following XH-compounds.

in which R represents an n-valent, optionally substituted, aliphatic, araliphatic or aromatic radical. X represents oxygen or sulphur, and n represents an integer from 1 to 6 (preferably from l to 3), except that R cannot represent ethyl when X represents oxygen, and n stands for one.

More particularly, R can represent a saturated or optionally unsaturated aliphatic radical with from 1 to 24, preferably 1 to 18, especially 1 to 8 and 3 to 8 carbon atoms, which may be substituted by atoms or radicals that are inert under the conditions under which these compounds are prepared. Examples of substituents such as these include one or more halogen (preferably fluor, chlor, brom) atoms and/or, aryl (preferably phenyl), alkoxy (preferably 1 to 4 carbonatoms), aroxy (preferibly q (preferably 9 aliphatic The process of the invention can be carried out in the fiiim iilffli ieii.lmi.Zi?..Zl'LZ its; 1. as of 1+ ry p p y p y p y bly the reaction 18 carried out at 0 and C, espemercapto (preferably C 1 cyano azldo or cially the reaction is started at 10 to 20 C and aftersulphonyl radicals. R can also represent the radical of wards during the reaction the temperature is raised up a (polymeric) compound with a molecular weight of to to 0 800 to 300o comammg ester and/or ether 40 Suitable solvents for this process are indifi'erent unthmether groups hydrous organic solvents, i.e.: ethers as dietbyl ether,

(preferably havmg up to 14 C atoms m dioxan, tetrahydrofuran and aliphatic and aromatic, the system especlany phenyl and naphthyl) and optionally halogenated hydrocarbons as for instance araliphaticwhenylethyl' preferably benzyl) radicals benzol, toluol, benzene, chlorobenzol, chloroform and may be substituted as mentioned above for the alkyl teuachlomcarbon.

radical: Generally, the process is carried out in such a manner The Invention p aPmcess P' that the dichloromethylene carbamic acid chloride is dichloromethylene carbamic acid esters which comdissolved in the solvent and h xflm ound i prises reacting dichloromethylene carbamic acid chlo- Slowly added under cooling f v completion of h ride with an alcohol, thioalcohol, Pheno1 P 9 reaction the formed dichloromethylene carbamic acid f a f' p of from to +100, Optionally ester, or thioester, is isolated from the resulting solum an ner Solvent tion, for instance by destillation or crystallization. It is The chlorine atoms of isocyanide dichlorides Y of course also possible to change the order of adding isocyanide dichlorides in particular, are known to react the with alcohols and thioalcohols under moderate condi- To t i h yields, fro 05 to 2 of tions under which the chlorine atoms of the carbamic chloromethylene b i id hl id are d per acid chlorides are also highly reactive. Accordingly, the equivalent of the -xn The two reactants three chlorine atoms of dichloromethylene carbamic are referabl d i a ti f f 0,8 t 1 2;1

acid chloride would be expected to react with alcohols The following compounds in particular can be oband thioalcohols at substantially the same velocity. It tained by the process according to the invention:

has surprisingly been found, however, that the chlorine Di hl h l b i id h l ester; ,5. atom of'th'e carboxylic acid chloride group can be 86- chloromethylene carbamic acid ethyl ester (this comlectively reacted in a smooth reaction to form the repound is known); dichloromethylene carbamic acid tquired dichloromethylene carbamic acid esters. butyl ester; dichloromethylene carbamic acid n-butyl Dichloromethylene carbamic acid chloride is a thio ester; bis-(dichloromethylene-carbamic acid)- known compound. Suitable starting materialsfor the butylene-1,4-ester; and dichloromethylene-carbamic process include compounds of the general formula acid phenyl ester and phenyl thio ester.

The compounds obtained by the process are liquid or solid compounds. They show pesticidal activity and may be used, for example, as herbicides, fungicides and acaricides. In addition they can be reacted by known methods like isocyanide dichlorides and may be used for example to produce the corresponding isocyanates.

For instance, 134 g (1.39 mols) of anhydrous methyl sulphonic acid are added dropwise at around 20 C to 208 g (1.34 mols) of dichloromethylene carbamic acid methyl ester in such a way that the internal temperature rises to 50 C. The hydrogen chloride bound in the form of carbamic acid chloride is then removed through a column over a period of hours during which the sump temperature gradually rises, and the product is worked up in the usual way. N- methoxycarbonyl isocyanate of b.p. 95-97 C/760 Torr is obtained in a yield of 99 g (73 percent of the theoretical).

The other new compounds that can be obtained by the process according to the invention can also be similarly converted into the corresponding isocyanates.

EXAMPLE 1 86.5 (1.88 mols) of absolute ethanol are added with thorough cooling and stirring over a period of 80 minutes to a solution of 300 g of dichloromethylene carbamic acid chloride (1.88 mols) in 350 ml. of ether (dried over sodium) [reaction temperature from to C The solution is kept at room temperature for 2 hours, the ether is distilled off and the product is rectified. The main fraction of 267 g (84 percent of the theoretical)[b.p. 2055-68 C] is redistilled through a column giving 230 g (72 percent of the theoretical) of dichloromethylene carbamic acid ethyl ester, b.p. 68 C./20 Torr.

EXAMPLE 2 The procedure is as in Example 1 except that the ethanol is replaced by 60 g of methanol. Dichloromethylene carbamic acid methyl ester is obtained in a yield of 205 g (b.p. 97 C/760 Torr).

EXAMPLE 3 The procedure is as described in Example 1, except that the ethanol is replaced by 139 g of t-butanol. Dichloromethylene carbamic acid t-butyl ester is obtained in a yield of 264 g (b.p. 75 C/l5 Torr).

EXAMPLE 4 90 g 1 mol) of n-butyl mercaptan and 160.5 g 1 mol) of dichloromethylene carbamic acid chloride are reacted in ether as described in Example 1. Di-

chloromethylene carbamic acid n-butyl thioester. having the formula is obtained in the form of a colourless oil of b.p. 1 18 C/ll Torr. in a yield of 170 g (79.5 percent of the theoretical). in an analogous manner the corresponding esters and thioesters are obtainable when hydroxyor thio-compounds of the formula are used, especially those mentioned on page 4.

What we claim is:

l. Process for preparing dichloromethylene carbamic acid esters which comprises reacting dichloromethylene carbamic acid chloride with a compound of the formula wherein n is an integer of from 1 to 6 inclusive;

X is oxygen; and

R is selected from the group of n-valent aliphatic radicals having up to 24 carbon atoms, phenylethyl, benzyl and phenyl radicals and any of the foregoing substituted with a substituent selected from the group of halo, lower allroxy, lower alkyl mercapto, phenylmercapto, nitro, cyano.

2. Process for preparing dichloromethylene carbamic acid esters which comprises reacting at a temperature of from -50 to C. dichloromethylene carbamic acid chloride with a compound of the formula wherein n is an integer of from 1 to 6 inclusive; and

R is selected from the group of n-valent aliphatic radicals having up to 24 carbon atoms, and the foregoing substituted with a substituent selected from the group of halo, lower alkoxy, lower alkyl mercapto, phenylmercapto, nitro, cyano. 3. Process as claimed in claim 2 wherein the reaction is carried out in an inert solvent.

4. Process as claimed in claim 2 wherein from 0.5 to 2 mols of dichloromethylene carbamic acid chloride are used per equivalent of said compound.

5. Process as claimed in claim 2 wherein the molar ratio of dichloromethylene carbamic acid chloride to said compound is in the range of from 0.8:1 to 1.2:1. t t i i 

2. Process for preparing dichloromethylene carbamic acid esters which comprises reacting at a temperature of from -50* to +100* C. dichloromethylene carbamic acid chloride with a compound of the formula R(OH)n wherein n is an integer of from 1 to 6 inclusive; and R is selected from the group of n-valent aliphatic radicals having up to 24 carbon atoms, and the foregoing substituted with a substituent selected from the group of halo, lower alkoxy, lower alkyl mercapto, phenylmercapto, nitro, cyano.
 3. Process as claimed in claim 2 wherein the reaction is carried out in an inert solvent.
 4. Process as claimed in claim 2 wherein from 0.5 to 2 mols of dichloromethylene carbamic acid chloride are used per equivalent of said compound.
 5. Process as claimed in claim 2 wherein the molar ratio of dichloromethylene carbamic acid chloride to said compound is in the range of from 0.8:1 to 1.2:1. 